- 5. How to chose welding lens shade??
- 4. why auto darkening welding lens operate unconsistantly when weld??
- 3. What is E, C, G, type I, type II marking on safety helmet???
- 2. What is UV light? does our spectacle provide UV protection??
- 1.Why you need PC lens for safety spectacles???
5. How to chose welding lens shade??
Generally speaking, lens shade depends on current amperages, you may download attached welding lens chart for reference.
Here simply list as below:
Covered electrodes: please chose shade#9--#14,
MIG: please chose shade #10-#15
TIG: please chose shade#9-#14
MAG: please chose shade#10-#15
4. why auto darkening welding lens operate unconsistantly when weld??
Ans:
If such situation happened, please check welding helmet by following procedure step by step:
Press "TEST" button located on filter lens,
- Filter changes from a clear state to a dark state immediately after pressing "TEST" button, and then changes back to be a clear state. That means battery is working. Please adjust "SENSITIVITY" knob to "high".
- "Low Battery" light flashing for a second; or filter doesn't change to dark status after pressing "TEST" button, it may "low battery". Please change the battery immediately.
3. What is E, C, G, type I, type II marking on safety helmet???
Ans:
According to ANSI Z87.1 regulation, there are separately impact test and electronic test:
--Impact test:
Type I: impact test for falling power from top, this is usually for safety industrial helmet
Type II: impact test for the falling power from top, right and left side. This is usually for motocycle helmet.
--Electronic test:
Class E: test with 20,000 voltage
Class G: test with 2,200 voltage
Class C: not necessary to go for electronic test.
***Parkson safety helmet conforms to ANSI Z89.1 Type I, class E, and CE EN397
2. What is UV light? does our spectacle provide UV protection??
Ans:
Ultra-Violet radiation is divided into UVC(100~280nm), UVB(290~315nm) and UVA(315~380nm).
Sudden intense UVA and UVB exposure can cause a “flash burn”, This makes the cornea and iris sore for a day or two, such as a sunburn on the skin.
With enough exposure, the cornea turns hazy white, sometimes beyond its ability to heal. This is the mechanism of snow blindness. It also will cause Cataract.
However, this could be prevent by wearing snuggles or safety spectacles. All spectacle lens of Parkson Safety have UV380 treatment, which provide almost 100% protection for your eyes, for UVA and UVB both hazard radiation.
We also provide UV400 treatment for free, but UV400 lens only needed when UV radiation source is significant.
1.Why you need PC lens for safety spectacles???
Ans:
There are three different material that usually apply in spectacles, glass, CR-39 Resin and Polycarbonate(PC).
According to European and American standard, the most common and good performance material in safety spectacle is Polycarbonate. PC lens is known as impact resistant, anti-scratch, UV protection, light weight, and economic price.
It is very dangerous to use Acrylic or plastic material as safety spectacle. Acrylic could not against scratch, impact and UVA radiation. Moreover, it is easy become deformed. And it will result in missing focus.
